MAX8952 View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

MAX8952

2.5A Step-Down Regulator with Remote Sense in 2mm x 2mm WLP

Maxim Integrated 

MAX8952

2.5A Step-Down Regulator

with Remote Sense in 2mm x 2mm WLP

SDA

SCL

Figure 9. I2C Bit Transfer

DATA LINE STABLE DATA VALID

CHANGE OF DATA ALLOWED

die temperature in excess of +160°C (typ), the

DC-DC step-down regulator is shut down, allowing the

IC to cool. The DC-DC step-down regulator is turned on

again after the junction cools by 20°C (typ), resulting in

a pulsed output during continuous thermal-overload

conditions.

During thermal overload, the I2C interface remains

active and all register values are maintained.

I2C Interface

An I2C-compatible, 2-wire serial interface controls the

step-down converter output voltage, ramp rate, operat-

ing mode, and synchronization. The serial bus consists

of a bidirectional serial-data line (SDA) and a serial-

clock input (SCL). The master initiates data transfer on

the bus and generates SCL to permit data transfer.

I2C is an open-drain bus. SDA and SCL require pullup

resistors (500Ω or greater). Optional (24Ω) in series

with SDA and SCL protect the device inputs from high-

voltage spikes on the bus lines. Series resistors also

minimize crosstalk and undershoot on bus signals.

Bit Transfer

One data bit is transferred during each SCL clock

cycle. The data on SDA must remain stable during the

high period of the SCL clock pulse (see Figure 9).

Changes in SDA while SCL is high are control signals

(see the START and STOP Conditions section for more

information).

Each transmit sequence is framed by a START (S) con-

dition and a STOP (P) condition. Each data packet is 9

bits long; 8 bits of data followed by the acknowledge

bit. The IC supports data transfer rates with SCL fre-

quencies up to 400kHz.

START and STOP Conditions

When the serial interface is inactive, SDA and SCL idle

high. A master device initiates communication by

issuing a START condition. A START condition is a

high-to-low transition on SDA with SCL high. A STOP

condition is a low-to-high transition on SDA, while SCL

is high (Figure 10).

A START condition from the master signals the begin-

ning of a transmission to the IC. The master terminates

transmission by issuing a not acknowledge followed by

SDA

SCL

START

CONDITION

Figure 10. I2C START and STOP Conditions

STOP

CONDITION

16

Maxim Integrated

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